feat: allow tailing a specific number of log lines

README.md

@@ -41,7 +41,7 @@ mongo:link <service> <app> [--link-flags...]       # link the mongo service to t
 mongo:linked <service> <app>                       # check if the mongo service is linked to an app
 mongo:links <service>                              # list all apps linked to the mongo service
 mongo:list                                         # list all mongo services
-mongo:logs <service> [-t|--tail]                   # print the most recent log(s) for this service
+mongo:logs <service> [-t|--tail] <tail-num-optional> # print the most recent log(s) for this service
 mongo:promote <service> <app>                      # promote service <service> as MONGO_URL in <app>
 mongo:restart <service>                            # graceful shutdown and restart of the mongo service container
 mongo:start <service>                              # start a previously stopped mongo service
@@ -154,12 +154,12 @@ dokku mongo:list
 
 ```shell
 # usage
-dokku mongo:logs <service> [-t|--tail]
+dokku mongo:logs <service> [-t|--tail] <tail-num-optional>
 ```
 
 flags:
 
-- `-t|--tail`: do not stop when end of the logs are reached and wait for additional output
+- `-t|--tail [<tail-num>]`: do not stop when end of the logs are reached and wait for additional output
 
 You can tail logs for a particular service:
 
@@ -173,6 +173,12 @@ By default, logs will not be tailed, but you can do this with the --tail flag:
 dokku mongo:logs lollipop --tail
 ```
 
+The default tail setting is to show all logs, but an initial count can also be specified:
+
+```shell
+dokku mongo:logs lollipop --tail 5
+```
+
 ### link the mongo service to the app
 
 ```shell